Core/MMaps: Handle path on same position

Handle path on the same polygon between 2 very close positions as a normal path.

src/server/game/Movement/PathGenerator.cpp

@@ -547,7 +547,14 @@ void PathGenerator::BuildPointPath(const float *startPoint, const float *endPoin
                 _pointPathLimit);    // maximum number of points
     }
 
-    if (pointCount < 2 || dtStatusFailed(dtResult))
+    // Special case with start and end positions very close to each other
+    if (_polyLength == 1 && pointCount == 1)
+    {
+        // First point is start position, append end position
+        dtVcopy(&pathPoints[1 * VERTEX_SIZE], endPoint);
+        pointCount++;
+    }
+    else if (pointCount < 2 || dtStatusFailed(dtResult))
     {
         // only happens if pass bad data to findStraightPath or navmesh is broken
         // single point paths can be generated here